144141-97-9 2-Oxa-4,7,12-triazatridecan-13-oic acid, 9-hydroxy-5-(1-methylethyl)-3,6-dioxo-8,11-bis(phenylmethyl)-1-(2-pyridinyl)-, 3-pyridinylmethyl ester, (5S,8S,9S,11S)- A 80987 A-80987 AIDS-028477 AIDS028477 Ritonavir deriv.